The brighter of Neptune's two new moons is provisionally named "S/2002 N5." At 14 miles (23 km) wide, this newly discovered satellite seems to be in a 9-year orbit around Neptune. The fainter moon ...

However, it is the fainter Neptune moon, provisionally named S/2021 N1, that presents a unique challenge. With a size of approximately 14 kilometers and an orbit spanning almost 27 years ...